Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Polarity-tuned Gel Polymer Electrolyte Coating of High-voltage LiCoO2 Cathode Materials

  • Park, Jang-Hoon (Department of Chemical Engineering, College of Engineering, Kangwon National University) ;
  • Cho, Ju-Hyun (Department of Chemical Engineering, College of Engineering, Kangwon National University) ;
  • Kim, Jong-Su (Techno Semichem) ;
  • Shim, Eun-Gi (Techno Semichem) ;
  • Lee, Yun-Sung (School of Applied Chemical Engineering, Chonnam National University) ;
  • Lee, Sang-Young (Department of Chemical Engineering, College of Engineering, Kangwon National University)
  • Received : 2011.05.25
  • Accepted : 2011.05.30
  • Published : 2011.05.31
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Abstract

We demonstrate a new surface modification of high-voltage lithium cobalt oxide ($LiCoO_2$) cathode active materials for lithium-ion batteries. This approach is based on exploitation of a polarity-tuned gel polymer electrolyte (GPE) coating. Herein, two contrast polymers having different polarity are chosen: polyimide (PI) synthesized from thermally curing 4-component (pyromellitic dianhydride/biphenyl dianhydride/phenylenediamine/oxydianiline) polyamic acid (as a polar GPE) and ethylene-vinyl acetate copolymer (EVA) containing 12 wt% vinyl acetate repeating unit (as a less polar GPE). The strong affinity of polyamic acid for $LiCoO_2$ allows the resulting PI coating layer to present a highly-continuous surface film of nanometer thickness. On the other hand, the less polar EVA coating layer is poorly deposited onto the $LiCoO_2$, resulting in a locally agglomerated morphology with relatively high thickness. Based on the characterization of GPE coating layers, their structural difference on the electrochemical performance and thermal stability of high-voltage (herein, 4.4 V) $LiCoO_2$ is thoroughly investigated. In comparison to the EVA coating layer, the PI coating layer is effective in preventing the direct exposure of $LiCoO_2$ to liquid electrolyte, which thus plays a viable role in improving the high-voltage cell performance and mitigating the interfacial exothermic reaction between the charged $LiCoO_2$ and liquid electrolytes.

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References

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